<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="stylesheet" href="./index.css" />
    <title>记事本</title>
</head>

<body>

    <!-- 主体区域 -->
    <section id="app">
        <!-- 输入框 -->
        <header class="header">
            <h1>小莺记事本</h1>
            <input placeholder="请输入任务" class="new-todo" v-model="task"/>
            <button class="add" @click="add">添加任务</button>
        </header>
        <!-- 列表区域 -->
        <section class="main">
            <ul class="todo-list">
                <li class="todo" v-for="(item, index) in todoList" :key="item.id">
                    <div class="view">
                        <span class="index">{{ index + 1 }}.</span> <label>{{ item.text }}</label>
                        <button class="destroy" @click="del(item.id)"></button>
                    </div>
                </li>
            </ul>
        </section>
        <!-- 统计和清空 -->
        <footer class="footer">
            <!-- 统计 -->
            <span class="todo-count">合 计:<strong> {{ todoList.length }} </strong></span>
            <!-- 清空 -->
            <button class="clear-completed" @click="clear">
                清空任务
            </button>
        </footer>
    </section>

    <!-- 底部 -->
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
    <script>

        const app = new Vue({
            el: '#app',
            data: {
                todoList: [
                    {
                        id: 1, text: '学习Vue'
                    },
                    {
                        id: 2, text: '学习SpringBoot'
                    },
                ],
                task: ''
            },
            methods: {
                add() {
                    this.todoList.push({
                        id: +new Date(),
                        text: this.task
                    });
                    this.task = '';
                },
                del(id) {
                    this.todoList = this.todoList.filter(item => item.id !== id);
                },
                clear() {
                    this.todoList = [];
                }
            }
        })

    </script>
</body>

</html>